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#ifndef _HIDDEV_H
#define _HIDDEV_H
* Copyright (c) 1999-2000 Vojtech Pavlik
* Sponsored by SuSE
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
* Should you need to contact me, the author, you can do so either by
* e-mail - mail your message to <>, or by paper mail:
* Vojtech Pavlik, Ucitelska 1576, Prague 8, 182 00 Czech Republic
#include <linux/types.h>
* The event structure itself
struct hiddev_event {
unsigned hid;
signed int value;
struct hiddev_devinfo {
__u32 bustype;
__u32 busnum;
__u32 devnum;
__u32 ifnum;
__s16 vendor;
__s16 product;
__s16 version;
__u32 num_applications;
struct hiddev_collection_info {
__u32 index;
__u32 type;
__u32 usage;
__u32 level;
#define HID_STRING_SIZE 256
struct hiddev_string_descriptor {
__s32 index;
char value[HID_STRING_SIZE];
struct hiddev_report_info {
__u32 report_type;
__u32 report_id;
__u32 num_fields;
/* To do a GUSAGE/SUSAGE, fill in at least usage_code, report_type and
* report_id. Set report_id to REPORT_ID_UNKNOWN if the rest of the fields
* are unknown. Otherwise use a usage_ref struct filled in from a previous
* successful GUSAGE call to save time. To actually send a value to the
* device, perform a SUSAGE first, followed by a SREPORT. An INITREPORT or a
* GREPORT isn't necessary for a GUSAGE to return valid data.
#define HID_REPORT_ID_UNKNOWN 0xffffffff
#define HID_REPORT_ID_FIRST 0x00000100
#define HID_REPORT_ID_NEXT 0x00000200
#define HID_REPORT_ID_MASK 0x000000ff
#define HID_REPORT_ID_MAX 0x000000ff
struct hiddev_field_info {
__u32 report_type;
__u32 report_id;
__u32 field_index;
__u32 maxusage;
__u32 flags;
__u32 physical; /* physical usage for this field */
__u32 logical; /* logical usage for this field */
__u32 application; /* application usage for this field */
__s32 logical_minimum;
__s32 logical_maximum;
__s32 physical_minimum;
__s32 physical_maximum;
__u32 unit_exponent;
__u32 unit;
/* Fill in report_type, report_id and field_index to get the information on a
* field.
#define HID_FIELD_CONSTANT 0x001
#define HID_FIELD_VARIABLE 0x002
#define HID_FIELD_RELATIVE 0x004
#define HID_FIELD_WRAP 0x008
#define HID_FIELD_NULL_STATE 0x040
#define HID_FIELD_VOLATILE 0x080
struct hiddev_usage_ref {
__u32 report_type;
__u32 report_id;
__u32 field_index;
__u32 usage_index;
__u32 usage_code;
__s32 value;
/* hiddev_usage_ref_multi is used for sending multiple bytes to a control.
* It really manifests itself as setting the value of consecutive usages */
struct hiddev_usage_ref_multi {
struct hiddev_usage_ref uref;
__u32 num_values;
__s32 values[HID_MAX_MULTI_USAGES];
/* FIELD_INDEX_NONE is returned in read() data from the kernel when flags
* is set to (HIDDEV_FLAG_UREF | HIDDEV_FLAG_REPORT) and a new report has
* been sent by the device
#define HID_FIELD_INDEX_NONE 0xffffffff
* Protocol version.
#define HID_VERSION 0x010004
* IOCTLs (0x00 - 0x7f)
#define HIDIOCGVERSION _IOR('H', 0x01, int)
#define HIDIOCAPPLICATION _IO('H', 0x02)
#define HIDIOCGDEVINFO _IOR('H', 0x03, struct hiddev_devinfo)
#define HIDIOCGSTRING _IOR('H', 0x04, struct hiddev_string_descriptor)
#define HIDIOCINITREPORT _IO('H', 0x05)
#define HIDIOCGNAME(len) _IOC(_IOC_READ, 'H', 0x06, len)
#define HIDIOCGREPORT _IOW('H', 0x07, struct hiddev_report_info)
#define HIDIOCSREPORT _IOW('H', 0x08, struct hiddev_report_info)
#define HIDIOCGREPORTINFO _IOWR('H', 0x09, struct hiddev_report_info)
#define HIDIOCGFIELDINFO _IOWR('H', 0x0A, struct hiddev_field_info)
#define HIDIOCGUSAGE _IOWR('H', 0x0B, struct hiddev_usage_ref)
#define HIDIOCSUSAGE _IOW('H', 0x0C, struct hiddev_usage_ref)
#define HIDIOCGUCODE _IOWR('H', 0x0D, struct hiddev_usage_ref)
#define HIDIOCGFLAG _IOR('H', 0x0E, int)
#define HIDIOCSFLAG _IOW('H', 0x0F, int)
#define HIDIOCGCOLLECTIONINDEX _IOW('H', 0x10, struct hiddev_usage_ref)
#define HIDIOCGCOLLECTIONINFO _IOWR('H', 0x11, struct hiddev_collection_info)
#define HIDIOCGPHYS(len) _IOC(_IOC_READ, 'H', 0x12, len)
/* For writing/reading to multiple/consecutive usages */
#define HIDIOCGUSAGES _IOWR('H', 0x13, struct hiddev_usage_ref_multi)
#define HIDIOCSUSAGES _IOW('H', 0x14, struct hiddev_usage_ref_multi)
* Flags to be used in HIDIOCSFLAG
#define HIDDEV_FLAG_UREF 0x1
#define HIDDEV_FLAGS 0x3
/* To traverse the input report descriptor info for a HID device, perform the
* following:
* rinfo.report_type = HID_REPORT_TYPE_INPUT;
* rinfo.report_id = HID_REPORT_ID_FIRST;
* ret = ioctl(fd, HIDIOCGREPORTINFO, &rinfo);
* while (ret >= 0) {
* for (i = 0; i < rinfo.num_fields; i++) {
* finfo.report_type = rinfo.report_type;
* finfo.report_id = rinfo.report_id;
* finfo.field_index = i;
* ioctl(fd, HIDIOCGFIELDINFO, &finfo);
* for (j = 0; j < finfo.maxusage; j++) {
* uref.report_type = rinfo.report_type;
* uref.report_id = rinfo.report_id;
* uref.field_index = i;
* uref.usage_index = j;
* ioctl(fd, HIDIOCGUCODE, &uref);
* ioctl(fd, HIDIOCGUSAGE, &uref);
* }
* }
* rinfo.report_id |= HID_REPORT_ID_NEXT;
* ret = ioctl(fd, HIDIOCGREPORTINFO, &rinfo);
* }
#ifdef __KERNEL__
* In-kernel definitions.
struct hid_device;
struct hid_usage;
struct hid_field;
struct hid_report;
int hiddev_connect(struct hid_device *hid, unsigned int force);
void hiddev_disconnect(struct hid_device *);
void hiddev_hid_event(struct hid_device *hid, struct hid_field *field,
struct hid_usage *usage, __s32 value);
void hiddev_report_event(struct hid_device *hid, struct hid_report *report);
int __init hiddev_init(void);
void hiddev_exit(void);
static inline int hiddev_connect(struct hid_device *hid,
unsigned int force)
{ return -1; }
static inline void hiddev_disconnect(struct hid_device *hid) { }
static inline void hiddev_hid_event(struct hid_device *hid, struct hid_field *field,
struct hid_usage *usage, __s32 value) { }
static inline void hiddev_report_event(struct hid_device *hid, struct hid_report *report) { }
static inline int hiddev_init(void) { return 0; }
static inline void hiddev_exit(void) { }